Berberis swaseyiM. J. Young, Flora of Texas 152. 1873. (Texas barberry) is a rare species of barberry endemic to the Edwards Plateau region of Texas. It grows in limestone ridges and canyons. The species is evergreen, with thick, rigid, five-to-nine foliolate leaves. Berries are dry or juicy, white to red, about 9–16 mm in diam.Correll, D. S. & M. C. Johnston. 1970. Manual of the Vascular Plants of Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.
The compound leaves place this species in the group sometimes segregated as the genus Mahonia.Flora of North America, vol 3Loconte, H., & J. R. Estes. 1989. Phylogenetic systematics of Berberidaceae and Ranunculales (Magnoliidae). Systematic Botany 14:565-579.Marroquín, Jorge S., & Joseph E. Laferrière. 1997. Transfer of specific and infraspecific taxa from Mahonia to Berberis. Journal of the Arizona-Nevada Academy of Science 30(1):53-55.Laferrière, Joseph E. 1997. Transfer of specific and infraspecific taxa from Mahonia to Berberis. Bot. Zhurn. 82(9):96-99.
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